"At the point of detonation, I could feel the heat, like someone ran a hot iron over the whole of my body, and I could see the bones in my elbow. I'm looking with my eyes shut and it was just as clear as could be. So first, its the light and the heat. We looked out at ground zero, and it was a vast dish and there were all the fumes and smoke rising out of it. It was green-black-purple, and just fused into one solid big bowl."